Yes, “kn” is a digraph. In modern English, the two letters k and n combine to produce a single sound: the “n” sound. The k is completely silent, which is the defining feature of a digraph, where two letters represent one phoneme rather than two separate sounds.
What Makes “kn” a Digraph
A digraph is a pair of letters that work together to represent a single sound. The key distinction is that you cannot hear both letters individually. When you say “knife,” “knock,” or “know,” your mouth only produces the “n” sound at the beginning. The k contributes nothing to the pronunciation. This is different from a consonant blend like “bl” in “blend” or “st” in “stop,” where you can hear both consonant sounds in sequence. With a blend, you can split the sounds apart. With a digraph like “kn,” there is nothing to split because only one sound exists.
Other common digraphs in English include “sh” (producing a single sound that is neither s nor h alone), “ch,” “th,” “wh,” and “wr.” The “kn” digraph is somewhat unusual because one of its letters is entirely silent rather than the two letters combining into a new, distinct sound. But it still meets the definition: two letters, one sound.
Why the K Is Silent
The k in “kn” was not always silent. In Old English and Middle English, speakers actually pronounced both the k and the n as separate sounds, much like you might hear in modern German words such as “Knecht” or “Knie.” The pronunciation began weakening over the 1600s, and by around 1750, standard English had dropped the k sound entirely. The spelling, however, never caught up. English spelling was largely standardized by the time of early printed books, so the k stayed on the page long after it disappeared from speech.
This is why so many “kn” words have close relatives in other Germanic languages where both sounds are still pronounced. The English word “knee” corresponds to the German “Knie,” “knife” to the Swedish “kniv,” and “knot” to the Dutch “knot.” The silent k is a fossil of an older pronunciation preserved in the spelling.
Common Words With the “kn” Digraph
The “kn” digraph appears at the beginning of dozens of everyday English words. Some of the most familiar include:
- know, knew, known, knowledge
- knee, kneel, kneed
- knife
- knock
- knot
- knit
- knob
- knack
- knave
- knead
- knell
- knickknack
In every case, the k is silent and the word begins with the “n” sound. There are no standard English words where “kn” at the start is pronounced with both sounds. If you encounter “kn” at the beginning of an English word, you can reliably treat it as a digraph and pronounce only the n.
Teaching “kn” as a Digraph
If you landed here because you are helping a child learn to read, “kn” is typically introduced alongside other digraphs like “wr” (where the w is silent) and “gn” (where the g is silent). The simplest way to explain it is that k and n are partners: when they stand together at the start of a word, k stays quiet and lets n do all the talking. Practicing with word pairs like “not” and “knot” or “new” and “knew” helps reinforce that the sounds are identical even though the spellings differ.